I have a 30 gal long glass tank that is about 20 years old and the silicone looks ragged in spots . I figure it about due for a reseal , but I can get a new 40 gal Acrylic tank for a good price . I would rather go with the acrylic . I have a 75 acrylic and I love it . A new tank would be less hassle than resealing the 30 and I would have to redo everything either way . My question is the stand for the 30 has 36 x 12.5 top footprint . The new tank is 36 x 15 . I am thinking I can take a piece of 3/4 inch plywood and cut it to fit the new tank , say 38 x 16 and put it on top of the stand and a piece of foam board on that , then the tank . That would be just an inch over on each end and 1.75 inches on the sides . The bulk of the weight would be over the stand's footprint . I know the 40 will be heavier , but I figure the difference between the glass and acrylic weight will just about equal out with the extra water . I have built stands from scratch , but really don't want to on this project . In my mind it will be fine , but I wanted to see if anyone has some first hand experience for anything similar . TIA .